Oleśnik [ɔˈlɛɕnik] is a village in the administrative district of Gmina Błędów, within Grójec County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 2 kilometres (1 mi) south-east of Błędów, 16 km (10 mi) south-west of Grójec, and 54 km (34 mi) south of Warsaw.

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